CN114928120A - Wind power plant SVG, wind turbine generator and fixed reactive power equipment coordination control method - Google Patents

Wind power plant SVG, wind turbine generator and fixed reactive power equipment coordination control method Download PDF

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Publication number
CN114928120A
CN114928120A CN202210442803.7A CN202210442803A CN114928120A CN 114928120 A CN114928120 A CN 114928120A CN 202210442803 A CN202210442803 A CN 202210442803A CN 114928120 A CN114928120 A CN 114928120A
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voltage
power
value
svg
wind
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Inventor
张勇
周秀冬
朱远
黄清军
朱思国
朱俊玮
蔡翔
孙诗依
李子昂
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Hunan Disaster Prevention Technology Co ltd
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Hunan Disaster Prevention Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The embodiment of the application provides a coordination control method and system for a wind power plant SVG, a wind turbine generator and a fixed reactive power device. The method comprises the following steps: determining the power Q provided by a wind turbine DFIG (ii) a According to the obtained target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And step difference Δ Q FC Presetting switching control on the fixed compensation device; obtaining effective voltage value U of grid-connected point S And determining the effective value U of the voltage S Whether the voltage is within a preset voltage range or not; in determining the effective value U of the voltage S Regulating the SVG device to adjust the effective value U of the voltage under the condition of not being in the preset voltage range S Performing compensation; determining compensated voltage validityValue U S Whether the voltage is within a preset voltage range or not; determining the effective value U of the compensated voltage S Under the condition of not being in the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate, so that the effective voltage value U is S And the voltage is in a preset voltage range so as to improve the utilization rate of equipment.

Description

Wind power plant SVG, wind turbine generator and fixed reactive power equipment coordination control method
Technical Field
The application relates to the technical field of electrical engineering, in particular to a coordination control method and system for a wind power plant SVG, a wind turbine generator and a fixed reactive power device.
Background
With the wide application of new energy, the utilization of wind power is more and more concerned and expected by the outside. Due to the characteristic of unstable wind power, the grid connection of the wind power plant usually has the problem of unstable voltage. Reactive compensation equipment SVG and fixed compensation equipment FC are usually configured in an existing wind power plant, reactive power in the plant is balanced and voltage is regulated through the reactive compensation equipment and the fixed compensation equipment, and the reactive power compensation equipment and the fixed compensation equipment are widely applied to a power system at present.
However, in the prior art, a relatively large redundancy is usually required to be left for switching compensation of the fixed reactive power equipment, which causes a certain resource waste. In addition, the current compensation mode mainly takes the matching of the reactive compensation equipment SVG and the fixed compensation equipment FC, and some of the current compensation modes also mainly take the coordination control of the reactive compensation equipment SVG and the wind turbine generator, so that a method and a strategy for carrying out coordination control on the running condition of the wind turbine generator and external reactive compensation equipment such as the reactive compensation equipment SVG are lacked.
Disclosure of Invention
The embodiment of the application aims to provide a coordination control method and system for SVG (scalable vector graphics), a wind turbine generator and fixed reactive power equipment of a wind power plant.
In order to achieve the above object, a first aspect of the present application provides a coordination control method for a wind farm SVG, a wind turbine generator, and a fixed reactive power device, including:
determining the power Q that the wind turbine can provide DFIG ；
According to the obtained target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC Presetting switching control is carried out on the fixed compensation device;
obtaining effective voltage value U of grid-connected point S And determining the effective value U of the voltage S Whether the voltage is within a preset voltage range or not; in determining the effective value U of the voltage S Under the condition of not being in the preset voltage range, the SVG equipment is adjusted to carry out regulation on the effective voltage value U S Performing compensation;
judging the compensated effective voltage value U S Whether the voltage is within a preset voltage range or not;
determining the effective value U of the compensated voltage S Under the condition of not being in the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so as to enable the voltage effective value U to be S Is in a preset voltage range.
Optionally, determining the power Q that the wind turbine can provide DFIG The method comprises the following steps: obtaining historical power observation data of the wind turbine generator, and recording the historical power observation data as S according to a time sequence 1 、S 2 、…、S t (ii) a According to S 1 、S 2 、…、S t Predicting observed value at t +1 moment
Figure BDA0003614733380000021
According to the observed value
Figure BDA0003614733380000022
Predicted power Q DFIG Wherein Q is DFIGt <S t (ii) a According to S 1 、S 2 、…、S t Predicting observed value at t +1 moment
Figure BDA0003614733380000023
The method comprises the following steps: determining the observed value at the moment of t +1 according to the formula (1)
Figure BDA0003614733380000024
Figure BDA0003614733380000025
Wherein w i Is the observed value weight at the t-i +1 th time, S t-i+1 Is the observed value of the t-i +1 th stage, N is the number of weights, Q DFIGt <S t 。
Optionally, the observation weight is adjusted by equation (2):
w′ i ＝w i +2ke i+1 S t-i+1 (2)
wherein i is 1,2, …, N, t is N, N +1, …, N, N is the number of sequence data, w is i Is the ith weight before adjustment, w' i For the adjusted ith weight, k is the learning constant, e i+1 The prediction error of the t +1 th period.
Optionally, according to the obtained target reactive power Q required by the fixed reactive equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC The preset switching control of the fixed compensation device comprises the following steps: determining a plurality of parameters including the reactive compensation power Q currently provided by the fixed compensation device FCin Maximum supply power Q of SVG equipment SVGMAX And the power Q provided by the wind turbine generator in real time DFIG And target reactive power Q L (ii) a In the case that a plurality of parameters satisfy the relation (3), a group of capacitors is added; under the condition that the relation among the parameters after the capacitors are added still meets the relation (3), the adding of one group of capacitors is continued until the capacitors are addedThe parameters satisfy the relation (4);
Q FCin +Q SVGMAX +Q DFIGmin <Q L (3)；
Q FCin +Q WVGMAX +Q DFIGmin >Q L (4)；
wherein Q DFIGmin The minimum power which can be provided for the wind turbine generator in real time.
Optionally, the coordination control method further includes: after determining the plurality of parameters, cutting off a group of capacitors in case the plurality of parameters satisfy relation (5); under the condition that the relation among the parameters after the capacitors are cut off still meets the relation (5), the cutting off of the group of capacitors is continued until the parameters after the capacitors are cut off meet the relation (6);
Q FCin -Q SVGMAX -Q DFIGmax >Q L (5)；
Q FCin -Q SVGMAX -Q DFIGmax <Q L (6)；
wherein Q DFIGmax The maximum power can be provided for the wind turbine generator in real time.
Optionally, the fixed capacitor regulation step difference satisfies the following relation (7):
ΔQ FC <(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7)；
wherein, is Δ Q FC Adjusting the step, Q, for a fixed capacitor DFIGmin Minimum power Q capable of being provided for wind turbine generator in real time DFIGmax The maximum power can be provided for the wind turbine generator in real time.
Optionally, the coordination control method further includes: obtaining voltage reference value U of grid-connected point L And a preset reasonable error value U Ldev (ii) a According to the voltage reference value U L And error range U Ldev Determining the lowest value U of the preset voltage range Lmin And the maximum value U Lmax Wherein the lowest value U Lmin Is a voltage reference value U L And reasonable error value U Ldev Difference of (2), maximum value U Lmax Is a voltage reference value U L And reasonable error valueU Ldev The sum of (1); at a voltage effective value U S At the lowest value U Lmin And the maximum value U Lmax In the case of (3), the effective value of the voltage U is determined S In a preset voltage range; at a voltage effective value U S Not at the lowest value U Lmin And the maximum value U Lmax In the middle, the effective value U of the voltage is determined S Not in the preset voltage range.
Optionally, the compensated voltage effective value U is determined S Under the condition that the voltage is not within the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is S The preset voltage range comprises the following steps: determining the effective value U of the compensated voltage S When the voltage is not in the preset voltage range and the power provided by the SVG equipment is the maximum value, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is enabled to be the maximum value S Is in a preset voltage range.
Optionally, the method further comprises: monitoring the reactive power output conditions of the wind turbine generator and the SVG equipment; under the condition that reactive circulation exists, reactive redistribution is carried out, and reactive power of the wind turbine generator and the SVG equipment is adjusted at the same time; and in the reactive power redistribution process, the wind generation set does not output reactive power, and simultaneously controls the SVG equipment to reduce the reverse reactive power output in the same quantity.
The application second aspect provides a coordinated control system of wind-powered electricity generation field SVG, wind turbine generator system and fixed reactive equipment, includes:
a reactive power calculation submodule for determining the power Q which can be provided by the wind turbine DFIG ；
The switching control module is used for obtaining the target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC Presetting switching control on the fixed compensation device;
a system voltage monitoring submodule for obtaining the effective voltage value U of the grid-connected point S And determining the effective value U of the voltage S Whether or not to positionWithin a predetermined voltage range;
a first compensation module for determining the effective value U of the voltage S Under the condition of not being in the preset voltage range, the SVG equipment is adjusted to carry out regulation on the effective voltage value U S Performing compensation;
a second compensation module for judging the compensated effective voltage value U S Whether the voltage is within a preset voltage range or not; determining the effective value U of the compensated voltage S Under the condition that the voltage is not within the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is S Is in a preset voltage range.
Through the technical scheme, the coordination control of the SVG, the fan generator set and the fixed reactive equipment of the wind power plant is realized, the advantages of the fixed reactive equipment are fully exerted, and the utilization rate of the equipment is improved. Meanwhile, the fixed compensation device is subjected to preset switching control, so that the fixed compensation device works in a proper gear, the switching times of the fixed compensation device is reduced, and the service life of the equipment is prolonged.
Additional features and advantages of embodiments of the present application will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the detailed description serve to explain the embodiments of the application and not to limit the embodiments of the application. In the drawings:
fig. 1 schematically shows a flow chart of a coordination control method for a wind farm SVG, a wind turbine generator and a fixed reactive device according to an embodiment of the present application;
fig. 2 schematically shows another flow chart of the coordination control method for the SVG, the wind turbine generator and the fixed reactive device in the wind farm according to the embodiment of the present application;
fig. 3 schematically shows a structural block diagram of a coordination control system of a wind farm SVG, a wind turbine generator and a fixed reactive device according to an embodiment of the present application;
fig. 4 schematically shows an internal structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the specific embodiments described herein are only used for illustrating and explaining the embodiments of the present application and are not used for limiting the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 schematically shows a flow chart of a coordination control method for a wind farm SVG, a wind turbine generator and a fixed reactive device according to an embodiment of the present application. As shown in fig. 1, in an embodiment of the present application, a coordinated control method for a wind farm SVG, a wind turbine generator and a fixed reactive power device is provided, which includes the following steps:
step 101, determining power Q which can be provided by a wind turbine generator DFIG 。
102, according to the obtained target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC And carrying out preset switching control on the fixed compensation device.
Step 103, obtaining the effective voltage value U of the grid-connected point S And determining the effective value U of the voltage S Whether it is within a preset voltage range.
Step 104, determining the effective value U of the voltage S Regulating the SVG device to adjust the effective value U of the voltage under the condition of not being in the preset voltage range S Compensation is performed.
Step 105, judging the compensated voltage effective value U S Whether the voltage is within a preset voltage range.
106, determining the compensated effective voltage value U S Under the condition of not being in the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so as to enable the voltage to be effectiveValue U S Is in a preset voltage range.
The SVG, the wind turbine generator and the fixed reactive equipment of the wind farm are coordinately controlled, and the processor can determine the power Q which can be provided by the wind turbine generator DFIG . The processor may then obtain the target reactive power Q required by the fixed reactive device L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC And the fixed compensation device is subjected to preset switching control. The preset switching control may refer to switching in a capacitor or switching out a capacitor. After the fixed compensation device is subjected to preset switching control, the processor can acquire the effective voltage value U of the grid-connected point S And determining the effective value U of the voltage S Whether the voltage is within a preset voltage range. At the moment of determining the effective value U of the voltage S Without being in the preset voltage range, the processor can adjust the SVG device to the effective voltage value U S Compensation is performed. To the effective value U of the voltage S After compensation, the processor can judge the effective value U of the compensated voltage S Whether it is within a preset voltage range. Determining the effective value U of the compensated voltage S Under the condition that the voltage is not in the preset voltage range, the processor can adjust the reactive power of the wind turbine generator to compensate so as to enable the voltage to have an effective value U S Is in a preset voltage range.
Through the technical scheme, coordinated control of the SVG, the fan electric group and the fixed reactive power equipment of the wind power plant is realized, the advantages of the fixed reactive power equipment are fully exerted, and the utilization rate of the equipment is improved. Meanwhile, the fixed compensation device is subjected to preset switching control, so that the fixed compensation device works in a proper gear, the switching times of the fixed compensation device is reduced, and the service life of the equipment is prolonged.
In one embodiment, the power Q that the wind turbine can provide is determined DFIG The method comprises the following steps: obtaining historical power observation data of the wind turbine generator, and recording the historical power observation data as S according to a time sequence 1 、S 2 、…、S t (ii) a According to S 1 、S 2 、…、S t Predicting the observed value at the time t +1
Figure BDA0003614733380000071
According to the observed value
Figure BDA0003614733380000072
Predicted power Q DFIG Wherein Q is DFIGt <S t (ii) a According to S 1 、S 2 、…、S t Predicting the observed value at the time t +1
Figure BDA0003614733380000073
The method comprises the following steps: determining the observed value at the moment of t +1 according to the formula (1)
Figure BDA0003614733380000074
Figure BDA0003614733380000075
Wherein, w i Is the observed value weight at the t-i +1 th time, S t-i+1 Is the observed value of the t-i +1 th stage, N is the number of weights, Q DFIGt <S t 。
The processor can obtain historical power observation data of the wind turbine generator, and records the historical power observation data as S according to a time sequence 1 、S 2 、…、S t . Wherein the time interval may be 1 s. I.e. every 1s, one power observation can be marked. The processor may then be based on S 1 、S 2 、…、S t Predicting observed value at t +1 moment
Figure BDA0003614733380000076
Specifically, the processor may determine the observed value at time t +1 according to equation (1) above
Figure BDA0003614733380000077
In the formula (1), w i Is the observed value weight at the t-i +1 th time, S t-i+1 The observed value of the t-i +1 th stage is shown, and N is the number of weights. In determining the observed value
Figure BDA0003614733380000078
In this case, the processor may be based on the observed value
Figure BDA0003614733380000079
Predicted power Q DFIG . Wherein Q DFIGt <S t . That is, the predicted power Q at time t DFIGt The observed value S can be less than time t t 。
In one embodiment, the observation weights are adjusted by equation (2):
w′ i ＝w i +2ke i+1 S t-i+1 (2)
wherein i is 1,2, …, N, t is N, N +1, …, N, N is the number of sequence data, w is i Is the ith weight before adjustment, w' i For the adjusted ith weight, k is a learning constant, e i+1 The prediction error of the t +1 th period.
The processor may adjust the observation weights by equation (2). In equation (2), the adjusted ith weight may be equal to the ith weight before adjustment plus an error adjustment term. The error adjustment term may include the prediction error e of the t +1 th period i+1 And the observed value S at the t-i +1 th stage t-i+1 And a learning constant k. The learning constant k can determine the speed of weight adjustment, and the learning constant k can be obtained by learning and fitting according to historical data.
In one embodiment, the target reactive power Q required by the fixed reactive equipment is obtained according to the obtained target reactive power Q L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC The preset switching control of the fixed compensation device comprises the following steps: determining a plurality of parameters including the reactive compensation power Q currently provided by the fixed compensation device FCin Maximum provided power Q of SVG equipment SVGMAX And the power Q provided by the wind turbine generator in real time DFIG And target reactive power Q L (ii) a Under the condition that a plurality of parameters satisfy the relation (3), a group of capacitors are added; after the addition of a capacitorUnder the condition that the relation among the parameters still meets the relation (3), continuously adding a group of capacitors until the parameters after the capacitors are added meet the relation (4);
Q FCin +Q SVGMAX +Q DFIGmin <Q L (3)；
Q FCin +Q SVGMAX +Q DFIGmin >Q L (4)；
wherein Q is DFIGmin The minimum power which can be provided for the wind turbine generator in real time.
The processor can obtain the target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC And carrying out preset switching control on the fixed compensation device. In particular, the processor may determine a plurality of parameters. Wherein the plurality of parameters may comprise the reactive compensation power Q currently supplied to the fixed compensation device FCin Maximum supply power Q of SVG equipment SVGMAX And the power Q provided by the wind turbine generator in real time DFIG And target reactive power Q L . There may be a relationship between multiple parameters. For example, the above-described relational expression (3) and relational expression (4) and the like. If multiple parameters satisfy the relationship (3), the processor may add a set of capacitors. After the addition of the group of capacitors, if the relationship between the parameters still satisfies the relationship (3), the addition of the group of capacitors may be continued until the relationship between the parameters satisfies the relationship (4). Q in the above-mentioned relational expressions (3) and (4) DFIGmin Can be expressed as the minimum power which can be provided by the wind turbine generator in real time.
In one embodiment, the coordination control method further includes: after determining the plurality of parameters, cutting off a group of capacitors in case the plurality of parameters satisfy relation (5); under the condition that the relation among the parameters after the capacitors are cut off still meets the relation (5), the cutting off of the group of capacitors is continued until the parameters after the capacitors are cut off meet the relation (6);
Q FCin -Q SVGMAX -Q DFIGmax >Q L (5)；
Q FCin -Q SVGMAX -Q DFIGmax <Q L (6)；
wherein Q is DFiGmax The maximum power can be provided for the wind turbine generator in real time.
The plurality of parameters may include reactive compensation power Q currently being supplied to the fixed compensation device FCin Maximum supply power Q of SVG equipment SVGMAX And the power Q provided by the wind turbine generator in real time DFIG And target reactive power Q L . After determining the plurality of parameters, the processor may cut off a group of capacitors if the relationship between the plurality of parameters satisfies relationship (5). After the cutting of the set of capacitors, if the relationship between the plurality of parameters still satisfies relationship (5), the processor may continue to cut the set of capacitors until the relationship between the plurality of parameters after the cutting of the capacitors satisfies relationship (6). Q in the above-mentioned relational expressions (5) and (6) DFIGmax The maximum power which can be provided by the wind turbine generator in real time can be expressed.
In one embodiment, the fixed capacitor tuning step size satisfies the following relationship (7):
ΔQ FC <(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7)；
wherein, is Δ Q FC Adjusting the step, Q, for a fixed capacitor DFIGmin Minimum power Q capable of being provided for wind turbine generator in real time DFIGmax The maximum power can be provided for the wind turbine generator in real time.
Q SVGMAX May refer to the maximum provided power of the SVG device. When the fixed compensation device is subjected to preset switching control, the regulating level difference of the fixed capacitor can satisfy the relation (7). That is, the adjustment level difference of the fixed capacitor may be smaller than twice the maximum power that the wind turbine can provide in real time plus the minimum power that the wind turbine can provide in real time and the maximum power that the SVG device can provide.
In one embodiment, a coordinated control methodFurther comprising: obtaining voltage reference value U of grid-connected point L And a preset reasonable error value U Ldev (ii) a According to the voltage reference value U L And error range U Ldev Determining the lowest value U of the preset voltage range Lmin And the maximum value U Lmax Wherein the lowest value U Lmin Is a voltage reference value U L And reasonable error value U Ldev Difference of (1), maximum value U Lmax Is a voltage reference value U L And reasonable error value U Ldev The sum of (1); at the effective value of voltage U S At the lowest value U Lmin And maximum value U Lmax In the case of (3), the effective value of the voltage U is determined S In a preset voltage range; at a voltage effective value U S Not at the lowest value U Lmin And the maximum value U Lmax In the case of (3), the effective value of the voltage U is determined S Not in the preset voltage range.
The processor can obtain the voltage reference value U of the grid-connected point L And a preset reasonable error value U Ldev . The processor can be based on the voltage reference value U L And error range U Ldev Determining the lowest value U of the preset voltage range Lmin And the maximum value U Lmax . Wherein the lowest value U Lmin Can be expressed as a voltage reference value U L And reasonable error value U Ldev Difference of (1), maximum value U Lmax Can be expressed as a voltage reference value U L And reasonable error value U Ldev The sum of (1). At the effective value of voltage U S At the lowest value U Lmin And the maximum value U Lmax In between, the processor may determine the voltage root mean square value U S Is in a preset voltage range. At this time, the voltage deviation thereof may be 0. At a voltage effective value U S Not at the lowest value U Lmin And the maximum value U Lmax In between, the processor may determine the voltage root mean square value U S Not in the preset voltage range. At this time, the voltage deviation may be a voltage effective value U S And a voltage reference value U L The difference of (c).
In one embodiment, the compensated voltage effective value U is determined S Adjusting the wind motor under the condition of not being in the preset voltage rangeThe group reactive power is compensated to make the voltage effective value U S The preset voltage range comprises: determining the effective value U of the compensated voltage S When the voltage is not in the preset voltage range and the power provided by the SVG equipment is the maximum value, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is enabled to be the maximum value S Is in a preset voltage range.
Determining the effective value U of the compensated voltage S Under the condition that the voltage is not in the preset voltage range, the processor can adjust the reactive power of the wind turbine generator to compensate so as to enable the voltage to have an effective value U S Is in a preset voltage range. In particular, the effective value of the voltage U after the compensation is determined S Under the conditions that the voltage is not in the preset voltage range and the power provided by the SVG equipment is the maximum value, the processor can adjust the reactive power of the wind turbine generator to compensate so as to ensure that the voltage effective value U is S Is in a preset voltage range. Wherein the compensated voltage effective value U S Not in the preset voltage range may refer to the voltage effective value U S Not at the lowest value U Lmin And the maximum value U Lmax In the meantime. At this time, the voltage deviation may be a voltage effective value U S And a voltage reference value U L I.e., the voltage deviation Δ U ≠ 0. Specifically, when the voltage deviation Δ U ≠ 0 and Q is detected SVG ＝Q SVGMAX In time, the processor can adjust the reactive power of the wind turbine generator to compensate so as to finely adjust the voltage, thereby obtaining the effective value U of the voltage S Is in a preset voltage range.
In one embodiment, further comprising: monitoring the reactive power output conditions of the wind turbine generator and the SVG equipment; under the condition that reactive circulation exists, reactive redistribution is carried out, and reactive power of the wind turbine generator and the SVG equipment is adjusted at the same time; and in the reactive power redistribution process, the wind generation set does not output reactive power, and simultaneously controls the SVG equipment to reduce the reverse reactive power output in the same quantity.
And if the reactive power of the wind turbine generator is compensated, the effective voltage value is not in the preset voltage range. Then, the processor can monitor the reactive output condition of the wind turbine generator and the SVG equipment. It can then be determined whether a reactive circulating current condition exists. The condition of reactive circulation can refer to the condition that the wind turbine generator generates capacitive reactive power and the SVG equipment generates inductive reactive power or the wind turbine generator generates inductive reactive power and the SVG equipment generates capacitive reactive power. And judging whether reactive circulation exists or not, and determining through a reactive circulation flag bit. When the reactive circulation flag is 1, it can be determined that reactive circulation exists. And under the condition that the reactive circulation exists, the processor can redistribute the reactive power and adjust the reactive power of the wind turbine generator and the SVG equipment at the same time. In the process of carrying out reactive power redistribution, the wind turbine generator system can not output reactive power, and simultaneously control the SVG equipment to reduce the reverse reactive power of equivalent output, can monitor the reactive power output condition of wind turbine generator system and SVG equipment once more.
In one embodiment, as shown in fig. 2, a flow diagram of a method for coordinating and controlling SVG, wind turbines and fixed reactive power equipment in a wind farm is also provided. The processor obtains historical data of the wind power and predicts the wind power by using a time series method. And then, the processor can set a gear for compensation of the fixed capacitor under the conditions of obtaining target power, maximum reactive power provided by the SVG equipment, power provided by the wind turbine generator and switching level difference of the fixed capacitor. When the SVG equipment and the current gear FC compensation capacity are insufficient to meet the target reactive power, a group of FC is put into use until the target reactive power is met. Wherein FC may refer to a capacitor. The processor may then determine whether the voltage meets the requirements. If the voltage meets the requirement, the adjustment is finished. If the voltage does not meet the requirement, the processor can utilize the quick response characteristic of the SVG equipment to perform reactive power regulation so as to enable the voltage to meet the requirement. After the first reactive power regulation, whether the voltage meets the voltage requirement can be judged again. If the voltage meets the requirement, the adjustment is finished. If the voltage does not meet the requirement, the processor can adjust the reactive power output by the wind turbine generator so as to perform secondary fine adjustment on the voltage. The reactive power output by the wind turbine generator can be subjected to reactive power distribution according to an equal power factor rule. The processor can monitor the reactive output conditions of the wind turbine generator and the SVG equipment and determine whether reactive circulation exists or not. At this time, if there is no reactive circulating current, the adjustment is ended. If reactive circulation exists, the processor can redistribute reactive power and optimize reactive power output of the SVG equipment and the wind generating set.
Through the technical scheme, coordinated control of the SVG, the fan electric group and the fixed reactive power equipment of the wind power plant is realized, the advantages of the fixed reactive power equipment are fully exerted, and the utilization rate of the equipment is improved. Meanwhile, preset switching control is carried out on the fixed compensation device, so that the fixed compensation device works in a proper gear, the switching times of the fixed compensation device is reduced, and the service life of the equipment is prolonged.
Fig. 1 is a schematic flow chart of a coordination control method for a SVG, a wind turbine generator and a fixed reactive device in a wind farm in one embodiment. It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 3, a coordinated control system for a wind farm SVG, a wind turbine generator and a fixed reactive device is provided, which includes a reactive power calculation sub-module, a switching control module, a system voltage monitoring sub-module, a first compensation module and a second compensation module, wherein:
a reactive power calculation submodule 301 for determining the power Q that can be provided by the wind turbine DFIG 。
A switching control module 302, configured to obtain a target reactive power Q required by the fixed reactive power equipment L SVG (static var generator) device of wind power plantPower Q SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC And carrying out preset switching control on the fixed compensation device.
A system voltage monitoring submodule 303 for obtaining a voltage effective value U of a grid-connected point S And determining the effective value U of the voltage S Whether it is within a preset voltage range.
A first compensation module 304 for determining the effective voltage value U S Under the condition of not being in the preset voltage range, the SVG equipment is adjusted to carry out regulation on the effective voltage value U S And (6) compensating.
A second compensation module 305 for determining the compensated effective voltage value U S Whether the voltage is within a preset voltage range or not; determining the effective value U of the compensated voltage S Under the condition of not being in the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so as to enable the voltage effective value U to be S Is in a preset voltage range.
The reactive power calculation submodule 301 may determine the power Q that the wind turbine generator can provide DFIG . Specifically, the reactive power calculation submodule 301 may obtain historical power observation data of the wind turbine, and record the historical power observation data as S according to a time sequence 1 、S 2 、…、S t . Wherein the time interval may be 1 s. That is, every 1s, one power observation can be marked. The reactive power calculation sub-module 301 may then calculate the reactive power according to S 1 、S 2 、…、S t Predicting the observed value at the time t +1
Figure BDA0003614733380000131
Specifically, the reactive power calculation submodule 301 may determine the observed value at the time t +1 according to the above equation (1)
Figure BDA0003614733380000132
In the formula (1), w i Is the weight of the observed value at the t-i +1 th time, S t-i+1 The observed value of the t-i +1 th stage is shown, and N is the number of weights. In determining the observed value
Figure BDA0003614733380000141
In this case, the reactive power calculation submodule 301 may calculate the reactive power based on the observed value
Figure BDA0003614733380000142
Predicted power Q DFIG . Wherein Q DFIGt <S t . I.e. predicted Q at time t DFIGt May be an observed value S less than time t t 。
The switching control module 302 may obtain the target reactive power Q required by the fixed reactive power device L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC And carrying out preset switching control on the fixed compensation device. The switching control module 302 may obtain the target reactive power Q required by the fixed reactive power device L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC And carrying out preset switching control on the fixed compensation device. Specifically, the switching control module 302 may determine a plurality of parameters. Wherein the plurality of parameters may comprise the reactive compensation power Q currently provided by the fixed compensation device FCin Maximum provided power Q of SVG equipment SVGMAX And the power Q provided by the wind turbine generator in real time DFIG And target reactive power Q L . There may be a relationship between multiple parameters. For example, Q FCin +Q SVGMAX +Q DFIGmin <Q L For convenience of the following description, this relation may be represented by relation (3). Q FCin +Q SVGMAX +Q DFIGmin >Q L For convenience of description, this relation may be represented by relation (4). Wherein Q is DFIGmin Can be expressed as the minimum power which can be provided by the wind turbine in real time. If the parameters satisfy the above relation (3), the switching control module 302 may add a set of capacitors. After adding a set of capacitors, if the relationship between the parameters is presentStill satisfying relation (3), the number of capacitors to be charged may be increased until the relation between the parameters satisfies relation (4).
The system voltage monitoring submodule 303 can obtain the effective voltage value U of the grid-connected point S And determining the effective value U of the voltage S Whether it is within a preset voltage range. The first compensation module 304 may be determining the voltage root mean square U S Regulating the SVG device to adjust the effective value U of the voltage under the condition of not being in the preset voltage range S Compensation is performed. In particular, the effective value of the voltage U after compensation is determined S Under the condition that the voltage is not in the preset voltage range and the power provided by the SVG equipment is the maximum value, the first compensation module 304 can adjust the reactive power of the wind turbine generator to compensate so as to enable the voltage effective value U to be in the maximum value S Is in a preset voltage range. The second compensation module 305 may determine the compensated effective voltage value U S Whether the voltage is within a preset voltage range or not; determining the effective value U of the compensated voltage S Under the condition of not being in the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so as to enable the voltage effective value U to be S Is in a preset voltage range.
The coordination control system of the wind power plant SVG, the wind turbine generator set and the fixed reactive power equipment comprises a processor and a memory, the reactive power calculation submodule, the switching control module, the system voltage monitoring submodule, the first compensation module, the second compensation module and the like are all stored in the memory as program units, and the processor executes the program modules stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the coordination control method for the SVG, the wind turbine generator and the fixed reactive power equipment of the wind power plant is realized by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
The embodiment of the application provides a storage medium, wherein a program is stored on the storage medium, and when the program is executed by a processor, the method for realizing the coordination control of the wind farm SVG, the wind turbine generator and the fixed reactive power equipment is realized.
The embodiment of the application provides a processor, wherein the processor is used for running a program, and the coordination control method of the wind power plant SVG, the wind turbine generator and the fixed reactive power equipment is executed when the program runs.
In one embodiment, a computer device is provided, which may be a server, and the internal structure thereof may be as shown in fig. 4. The computer device includes a processor a01, a network interface a02, a memory (not shown), and a database (not shown) connected by a system bus. Wherein processor a01 of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises internal memory a03 and non-volatile storage medium a 04. The non-volatile storage medium a04 stores an operating system B01, a computer program B02, and a database (not shown in the figure). The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a 04. The database of the computer device is used for storing data such as effective voltage values. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. When being executed by the processor a01, the computer program B02 implements a coordinated control method for the wind farm SVG, the wind turbine generator and the fixed reactive equipment.
It will be appreciated by those skilled in the art that the configuration shown in fig. 4 is a block diagram of only a portion of the configuration associated with the present application, and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
The embodiment of the application provides equipment, the equipment comprises a processor, a memory and a program which is stored on the memory and can run on the processor, and the following steps are realized when the processor executes the program: determining the power Q that the wind turbine can provide DFIG (ii) a According to obtainingObtaining the target reactive power Q required by the fixed reactive equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC Presetting switching control on the fixed compensation device; obtaining effective voltage value U of grid-connected point S And determining the effective value U of the voltage S Whether the voltage is within a preset voltage range or not; at the moment of determining the effective value U of the voltage S Under the condition of not being in the preset voltage range, the SVG equipment is adjusted to carry out regulation on the effective voltage value U S Compensation is carried out; judging the compensated effective voltage value U S Whether the voltage is within a preset voltage range or not; determining the effective value U of the compensated voltage S Under the condition that the voltage is not within the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is S Is in a preset voltage range.
In one embodiment, the power Q that the wind turbine can provide is determined DFIG The method comprises the following steps: obtaining historical power observation data of the wind turbine generator, and recording the historical power observation data as S according to a time sequence 1 、S 2 、…、S t (ii) a According to S 1 、S 2 、…、S t Predicting observed value at t +1 moment
Figure BDA0003614733380000161
According to the observed value
Figure BDA0003614733380000162
Predicted power Q DFIG Wherein Q is DFIGt <S t (ii) a According to S 1 、S 2 、…、S t Predicting observed value at t +1 moment
Figure BDA0003614733380000163
The method comprises the following steps: determining the observed value at the moment of t +1 according to the formula (1)
Figure BDA0003614733380000164
Figure BDA0003614733380000165
Wherein, w i Is the observed value weight at the t-i +1 th time, S t-i+1 Is the observed value of the t-i +1 th stage, N is the number of weights, Q DFIGt <S t 。
In one embodiment, the observation weights are adjusted by equation (2):
w′ i ＝w i +2ke i+1 S t-i+1 (2)
wherein i is 1,2, …, N, t is N, N +1, …, N, N is the number of sequence data, w is i Is the i ' weight, w ' before adjustment ' i For the adjusted ith weight, k is the learning constant, e i+1 The prediction error of the t +1 th period.
In one embodiment, the target reactive power Q required by the fixed reactive equipment is obtained according to the obtained target reactive power Q L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC The preset switching control of the fixed compensation device comprises the following steps: determining a plurality of parameters including the reactive compensation power Q currently provided by the fixed compensation device FCin Maximum provided power Q of SVG equipment SVGMAX And the power Q provided by the wind turbine generator in real time DFIG And target reactive power Q L (ii) a In the case that a plurality of parameters satisfy the relation (3), a group of capacitors is added; under the condition that the relation among the parameters after the capacitors are added still meets the relation (3), continuously adding and inputting a group of capacitors until the parameters after the capacitors are added meet the relation (4);
Q FCin +Q SVGMAX +Q DFIGmin <Q L (3)；
Q FCin +Q SVGMAX +Q DFIGmin >Q L (4)；
wherein Q is DFIGmin The minimum power which can be provided for the wind turbine generator in real time.
In one embodiment, the coordinated control method further comprises: after determining the plurality of parameters, cutting off a group of capacitors in case the plurality of parameters satisfy relation (5); under the condition that the relation among the parameters after the capacitors are cut off still meets the relation (5), the cutting off of a group of capacitors is continued until the parameters after the capacitors are cut off meet the relation (6);
Q FCin -Q SVGMAX -Q DFIGmax >Q L (5)；
Q FCin -Q SVGMAX -Q DFIGmax <Q L (6)；
wherein Q is DFIGmax The maximum power can be provided for the wind turbine generator in real time.
In one embodiment, the fixed capacitor tuning step size satisfies the following relationship (7):
ΔQ FC <(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7)；
wherein, is Δ Q FC Adjusting the step, Q, for a fixed capacitor DFIGmin Minimum power Q capable of being provided for wind turbine generator in real time DFIGmax The maximum power can be provided for the wind turbine generator in real time.
In one embodiment, the coordination control method further includes: obtaining voltage reference value U of grid-connected point L And a preset reasonable error value U Ldev (ii) a According to the voltage reference value U L And error range U Ldev Determining the lowest value U of the preset voltage range Lmin And the maximum value U Lmax Wherein the lowest value U Lmin Is a voltage reference value U L And reasonable error value U Ldev Difference of (1), maximum value U Lmax Is a voltage reference value U L And reasonable error value U Ldev The sum of (1); at a voltage effective value U S At the lowest value U Lmin And the maximum value U Lmax In the case of (3), the effective value of the voltage U is determined S In a preset voltage range; at a voltage effective value U S Not at the lowest value U Lmin And maximum value U Lmax In the middle, the effective value U of the voltage is determined S Not in the preset voltage range.
In one embodiment, the compensated voltage effective value U is determined S Under the condition of not being in the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so as to enable the voltage effective value U to be S The preset voltage range comprises: determining the effective value U of the compensated voltage S Under the conditions that the voltage is not in a preset voltage range and the power provided by the SVG equipment is already at the maximum value, the reactive power of the wind turbine generator is adjusted to compensate so as to enable the voltage to have an effective value U S Is in a preset voltage range.
In one embodiment, further comprising: monitoring the reactive power output conditions of the wind turbine generator and the SVG equipment; under the condition that the reactive circulation exists, reactive redistribution is carried out, and the reactive power of the wind turbine generator and the SVG equipment is adjusted at the same time; wherein, carrying out reactive redistribution's in-process, wind turbine generator system does not output reactive power, and controls SVG equipment to reduce the reverse reactive power of equivalent output simultaneously.
The present application also provides a computer program product adapted to execute a program initializing the steps of the coordinated control method of the SVG, the wind turbine generator and the fixed reactive device when executed on a data processing device.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information and/or information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims (10)

1. A coordination control method for SVG, wind turbine generator and fixed reactive power equipment in a wind power plant is characterized by comprising the following steps:
determining the power Q which can be provided by the wind turbine generator DFIG ；
According to the obtained target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a step difference Δ Q FC Presetting switching control is carried out on the fixed compensation device;
obtaining effective voltage value U of grid-connected point S And judging the effective value U of the voltage S Whether the voltage is within a preset voltage range or not;
upon determination of said voltage effective value U S Not in the condition of the preset voltage range, adjusting the SVG equipment to correct the voltage effective value U S Compensation is carried out;
judging the effective value U of the compensated voltage S Whether the voltage is within the preset voltage range or not;
determining the compensated voltage effective value U S Under the condition that the voltage is not within the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is S And the voltage is in the preset voltage range.
2. The coordinated control method for wind farm SVG, wind turbines and fixed reactive devices according to claim 1, characterized in that said determining the power Q that said wind turbines can provide DFIG The method comprises the following steps:
obtaining historical power observation data of the wind turbine generator, and recording the historical power observation data as S according to a time sequence 1 、S 2 、…、S t ；
According to S 1 、S 2 、…、S t Predicting the observed value at the time t +1
Figure FDA0003614733370000011
According to the observed value
Figure FDA0003614733370000012
Predicting the power Q DFIG Wherein Q is DFIGt ＜S t ；
Said according to S 1 、S 2 、…、S t Predicting observed value at t +1 moment
Figure FDA0003614733370000013
The method comprises the following steps: determining the observed value at the moment of t +1 according to the formula (1)
Figure FDA0003614733370000014
Figure FDA0003614733370000021
Wherein, w i Is the observed value weight at the t-i +1 th time, S t-i+1 Is the observed value of the t-i +1 th stage, N is the number of weights, Q DFIGt ＜S t 。
3. The method for coordinated control of wind farm SVG, wind turbines and fixed reactive equipment according to claim 2, further comprising adjusting the observation weights by equation (2):
w′ i ＝w i +2ke i+1 S t-i+1 (2)
wherein i is 1,2, …, N, t is N, N +1, …, N, N is the number of sequence data, w i Is the ith weight before adjustment, w' i For the adjusted ith weight, k is the learning constant, e i+1 The prediction error of the t +1 th period.
4. The coordinated control method for the SVG, the wind turbine and the fixed reactive equipment of the wind farm according to claim 1, characterized in that said target reactive power Q required by said fixed reactive equipment is obtained according to said obtained L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC The preset switching control of the fixed compensation device comprises the following steps:
determining a plurality of parameters including reactive compensation power Q currently provided by the active fixed compensation device FCin The maximum supply power Q of the SVG device SVGMAX The power Q which can be provided by the wind turbine generator in real time DFIG And the target reactive power Q L ；
In the case where the plurality of parameters satisfy the relation (3), adding a set of capacitors;
under the condition that the relation among the parameters after the capacitors are added still meets the relation (3), continuing to add a group of capacitors until the parameters after the capacitors are added meet the relation (4);
Q FCin +Q SVGMAX +Q DFIGmin ＜Q L (3)；
Q FCin +Q SVGMAX +Q DFIGmin ＞Q L (4)；
wherein Q is DFIGmin And providing the minimum power for the wind turbine generator in real time.
5. The coordinated control method for wind farm SVG, wind turbines and fixed reactive devices according to claim 4, characterized in that said coordinated control method further comprises:
after said determining a plurality of parameters, cutting off a set of capacitors if said plurality of parameters satisfies relation (5);
under the condition that the relation among the parameters after the capacitors are cut off still meets the relation (5), the cutting off of the group of capacitors is continued until the parameters after the capacitors are cut off meet the relation (6);
Q FCi n-Q SVGMAX -Q DFIGmax ＞Q L (5)；
Q FCi n-Q SVGMAX -Q DFIGmax ＜Q L (6)；
wherein Q DFIGmax And providing the maximum power which can be provided by the wind turbine generator in real time.
6. The coordinated control method for wind farm SVG, wind turbines and fixed reactive devices according to claim 4 or 5, characterized in that the fixed capacitor regulation level difference satisfies the following relation (7):
ΔQ FC ＜(2Q SVGMAX +Q DFIGmax +Q DEIGmin ) (7)；
wherein, is Δ Q FC For fixing capacitor regulationLevel difference, Q DFIGmin Minimum power Q capable of being provided by the wind turbine generator in real time DFIGmax And providing the maximum power which can be provided by the wind turbine generator in real time.
7. The coordinated control method for the SVG, the wind turbines and the fixed reactive equipment of the wind farm according to claim 1, characterized in that the coordinated control method further comprises:
obtaining voltage reference value U of grid-connected point L And a preset reasonable error value U Ldev ；
According to the voltage reference value U L And the error range U Ldev Determining the lowest value U of the preset voltage range Lmin And maximum value U Lmax Wherein the lowest value U Lmin Is the voltage reference value U L And reasonable error value U Ldev Difference of (1), maximum value U Lmax Is the voltage reference value U L And reasonable error value U Ldev The sum of (1);
at said voltage effective value U S At the lowest value U Lmin And the maximum value U Lmax In the middle, the effective value U of the voltage is determined S In the preset voltage range;
at said voltage effective value U S Not at said lowest value U Lmin And the maximum value U Lmax In the case of (b), determining the voltage root mean square value U S Not in the preset voltage range.
8. The method of coordinated control of wind farm SVG, wind turbines and fixed reactive equipment according to claim 7, characterised in that said compensated voltage utility value U is determined S Under the condition that the voltage is not within the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is S The preset voltage range comprises the following steps:
determining the compensated voltage effective value U S Is not in the preset voltage range, and the power provided by the SVG device is already at the maximum valueUnder the condition of (1), adjusting the reactive power of the wind turbine generator set to compensate so as to enable the voltage effective value U to be S And the voltage is in the preset voltage range.
9. The coordinated control method for the SVG, the wind turbine and the fixed reactive equipment of the wind farm according to claim 1, characterized by further comprising:
monitoring the reactive power output conditions of the wind turbine generator and the SVG equipment;
under the condition that reactive circulation exists, performing reactive redistribution, and adjusting reactive power of the wind turbine generator and the SVG equipment;
wherein, carrying out the in-process of reactive redistribution, wind turbine generator system does not export reactive power, and controls simultaneously SVG equipment reduces the reverse reactive power of equivalent output.
10. The utility model provides a coordinated control system of wind-powered electricity generation field SVG, wind turbine generator system and fixed reactive equipment which characterized in that includes:
a reactive power calculation submodule for determining the power Q which can be provided by the wind turbine DFIG ；
The switching control module is used for acquiring target reactive power Q required by the fixed reactive power equipment L Power Q provided by SVG equipment of wind power plant SVGMAX Power Q provided by wind power plant fixed compensation device FC And a difference of grade Δ Q FC Presetting switching control is carried out on the fixed compensation device;
a system voltage monitoring submodule for acquiring the effective voltage value U of the grid-connected point S And judging the effective value U of the voltage S Whether the voltage is within a preset voltage range or not;
a first compensation module for determining the effective value U of the voltage S Under the condition that the voltage is not in the preset voltage range, the SVG equipment is adjusted to have the voltage effective value U S Compensation is carried out;
a second compensation module for judging the compensated effective voltage value U S Whether or not it is at the preset voltageA range; determining the compensated voltage effective value U S Under the condition that the voltage is not within the preset voltage range, the reactive power of the wind turbine generator is adjusted to compensate so that the voltage effective value U is S And the voltage is in the preset voltage range.
CN202210442803.7A 2022-04-25 2022-04-25 Wind power plant SVG, wind turbine generator and fixed reactive power equipment coordination control method Pending CN114928120A (en)

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CN114928120A true CN114928120A (en) 2022-08-19

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